Selecting Research Participants
Selecting Research Participants PSYC-31574-003
Popular in Research Methods In Psychology
Popular in Psychlogy
This 2 page Class Notes was uploaded by Amy Turk on Monday April 4, 2016. The Class Notes belongs to PSYC-31574-003 at Kent State University taught by Dr. Tanjeem Azad in Spring 2016. Since its upload, it has received 12 views. For similar materials see Research Methods In Psychology in Psychlogy at Kent State University.
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Date Created: 04/04/16
SELECTING RESEARCH PARTICIPANTS ● Method of selection determines the population to which we generalize findings ● Population:group of interest ● Sample: subset of the population that is chosen for study ● Sampling: process by which the researcher chooses a sample from a population Goal of Sampling ● To be a representative of the population as much as possible ● Have the same proportions as the original population ● The random sample: e veryone in the population has an equal chance of being chosen for the sample ○ Most behavioral research does not use random samples Probability Sampling ● Everyone has an eq ual probability of being in the sample ● Representative ● Sampling error: ifference between scores obtained on a sample and the scores that would have been obtained if the entire population had been studied ● Error of estimation (margin of errordegree to which the data obtained from the sample are expected to vary from the population as a whole ○ The smaller the error, the better Simple Random Sampling ● Must have a sampling frame ○ List of all members in your population ● Random number generator Systematic Sampling ● Every nth person ● Don’t need a sampling frame Stratified Random Sampling ● Divide population intostratasubsets of a population based on a particular characteristic ○ Age ○ Male ○ Female ● Randomly choose from all strata ● Requires sampling frame of all cases ● Ensures ample numbers of participants from each stratum ● Proportionate sampling method Cluster Sampling ● Identify clusters of the population, based on naturally occurring groups ● Randomly select clusters ● Easiest and most practical method ● No sampling frame, only a list of clusters Threats to Responsiveness ● No response
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